SCSI Description
5–28 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
FORMAT UNIT Command (04h) (continued)
5.10.2.1 FORMAT UNIT Defect List Header
The FORMAT UNIT Defect List Header (Figure 5-6) provides several optional
format control bits to give the initiator more control over the defect lists. Table 5-9
provides descriptions of the data fields in the Defect List Header.
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved
1 FOV DPRY DCRT STPF IP DSP Immed VS
2 - 3 Defect List Length
Figure 5–6 FORMAT UNIT Defect List Header — Data Format
Table 5–9 FORMAT UNIT Defect List Header — Field Descriptions
Name Description
FOV The Format Options Valid bit indicates that the remaining option bits in this
byte are valid. If this bit is not set, the remaining bits, except Immed, are
ignored.
DPRY The Disable Primary bit specifies whether the drive should ignore the Primary
Defect List during the format to identify defective areas on the media. The
drive's default is 0, indicating that the drive should replace sectors found in
the Primary Defect List during the format.
DCRT The Disable Certification bit specifies whether the drive should certify the
media during the format. The drive’s default is 0, indicating that the drive
should certify the media.
STPF The Stop Format bit specifies the error conditions under which the drive is to
terminate the format. The state of the bit is ignored and the drive acts as if
this bit is set. If either the Grown Defect List or the Primary Defect List is not
found, the format operation terminates with a CHECK CONDITION status and
a sense key of MEDIUM ERROR.
IP The Initialization Pattern bit signals the drive that the FORMAT UNIT
Parameter List contains initialization pattern information.
An Initialization Pattern bit of 1 indicates that an initialization pattern
descriptor (Figure 5-7) is included in the FORMAT UNIT parameter list
immediately following the Defect List Header.
An Initialization Pattern bit of 0 indicates that an initialization pattern
descriptor (Figure 5-7) is not included in the FORMAT UNIT parameter list,
and the drive will use its default initialization pattern of all zeros.
(continued)
